[Issue 18100] crt_constructor not allow to init immutable

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18100

--- Comment #7 from Steven Schveighoffer <schveiguy at yahoo.com> ---
(In reply to Iain Buclaw from comment #6)
> This has got nothing to do with "betterC", whatever that means.

Actually, this is all about betterC. betterC means no druntime, which means no
static ctor/dtor.

pragma(crt_constructor) was added as a way to hook the C library's static
constructor system when you don't have druntime.

But your larger point was correct.

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